question about Fairfield Problem?

We, mistakenly, bought a FF timeshare a few years ago. In the past few years, we have only used it once! Everytime we call, everything we want is 'sold out,' or not available. They refuse to even waitlist an area like RCI does. We tried to transfer over our points to RCI and it was like pulling teeth with a mule! Bascially, we have paid for nothing! We have been trying to sell it, even at a loss, but unsuccessful. How does one go about giving back a timeshare to the developer? Does this effect one's credit? It's such a rip off and we plan on complaining to the AG in NM, but we are not hopeful of ever seeing a dime back on this! It seems as if the lawyers for the RCI lawsuit should get involved with FF, too!